// Initializes a basic model.
var model = new EdmModel();

// Entity type 'user', with a single string property: its key 'id'.
var user = model.AddEntityType("graph", "user", baseType: null, isAbstract: false, isOpen: false, hasStream: false);
var keyProperty = user.AddStructuralProperty("id", EdmPrimitiveTypeKind.String, isNullable: false);
user.AddKeys(keyProperty);

// Entity container, with entity set 'users'.
var container = model.AddEntityContainer("graph", "service");
container.AddEntitySet("users", user);

// Function 'getConnections' bound to a 'user', with an int parameter and returning a collection of 'user'.
var userReference = new EdmEntityTypeReference(user, isNullable: false);
var userCollectionReference = new EdmCollectionTypeReference(new EdmCollectionType(userReference));
var getConnections = new EdmFunction("graph", "getConnections", userCollectionReference, isBound: true, entitySetPathExpression: null, isComposable: true);
getConnections.AddParameter("boundParameter", userReference);
getConnections.AddParameter("degree", EdmCoreModel.Instance.GetPrimitive(EdmPrimitiveTypeKind.Int16, isNullable: false));
model.AddElement(getConnections);

// Simple URI: accesses an entity from the collection returned by the function 'getConnections'.

// Works: KeySegment after OperationSegment uses key-as-segment syntax.
var parser = new ODataUriParser(model, new System.Uri("/users('doe')/graph.getConnections(degree=1)/fawn", System.UriKind.Relative));
var path = parser.ParsePath();
Assert.IsNotNull(path);
Assert.AreEqual(4, path.Count); // EntitySetSegment, KeySegment, OperationSegment, KeySegment.

// Throws: KeySegment after OperationSegment uses default key-parens syntax.
parser = new ODataUriParser(model, new System.Uri("/users('doe')/graph.getConnections(degree=1)('fawn')", System.UriKind.Relative));
try
{
    path = parser.ParsePath();
    Assert.Fail("Never reached, as ParsePath throws.");
}
catch (ODataException e)
{
    Assert.AreEqual("Syntax error at position 9 in 'degree=1)('fawn''.", e.Message);
}